DES MOINES, Iowa — One man has been arrested, and a warrant issued for another in an attack at Iowa Congressman Leonard Boswell's home Saturday night, according to a report in the Des Moines Register.

The alleged getaway driver, Cody John Rollins, 19, of Lamoni, Iowa, was arrested Monday, according to Decatur County Sheriff Herbert Muir. The alleged intruder, David Palmer Dewberry, 20, of Fremont, Neb., has a warrant out for his arrest.

The intruder is the son of a family friend, reported the Des Moines Register. Police asked the public to be on the lookout for Dewberry, who could be armed and dangerous.

According to online court records, Dewberry has a record. He was charged with third-degree theft in 2009 in juvenile court. He will face felony charges of burglary and assault while committing a felony if arrested, police said.

Boswell, an eight-term congressman helped fight off an armed man, allegedly Dewberry, who invaded his farm house in Decatur County and attacked his daughter on Saturday night, according to a statement from his office.

The attack occurred around 10:45 p.m. on Saturday at a farm in Lamoni, where Boswell, a 77-year-old Democrat who represents Iowa's third congressional district, was spending the weekend with his wife, Dody, 77, daughter, Cynthia Brown, and grandson, Mitchell Brown, 22.

"The intruder entered the front door of the farm house and physically assaulted Cindy while demanding money at gunpoint," read the statement from Boswell's office.

After hearing his daughter's screams, the congressman "entered the walkway of their house and immediately went for the guy's gun and was wrestling with him. They were both on the ground," Boswell's chief of staff Grant Woodard told local news station KCCI.

While the two scuffled, Boswell's grandson Mitchell grabbed a loaded .12-gauge shotgun from a nearby room and confronted the intruder, who then fled into the surrounding field and reportedly was still on the run.

"That was my daughter. This guy had his hand on her throat and a gun to her face. If he was going to shoot somebody, I preferred that he shoot me," Boswell said in an interview with easterniowagovernment.com.

Boswell praised his entire family for their "grit" and "determination" in fighting off the attacker.

"The congressman just did what anybody would do if he knew his family was in trouble," said Woodard. "He jumped right into the situation and helped his daughter."

Boswell lives in Des Moines and owns the farm in southern Iowa. He is recovering from a broken rib suffered during the incident.

"I wanted a piece of him. He was threatening somebody I care for very much," Boswell told reporters at a Statehouse news conference, according to easterniowagovernment.com.

The Decatur County Sheriff's Department and state and federal authorities are investigating. The sheriff's department said Saturday that the intruder had not been caught. The attacker is still at large.

Decatur County Sheriff Herbert Muir said "we might" have a suspect in mind. "We have a direction we're going," Muir said, according to easterniowagovernment.com.

"The congressman says the military is the best training for situations like this," said Woodard, referring to Boswell's 20-year military career. "It's a wakeup call to everybody to take precautions and do what they need to do to keep their family safe."